대부분의 유동층 연소장치에서 층물질과 비산된 입자에 의한 층내 전열관과 water wall의 전열관 표면의 마모는 계속적으로 골칫거리가 되고 있다. 본 연구는 단면적이 0.15 m × 0.30 m인 상온유동층장치에서 마모하기 쉬운 아크릴 관을 사용하여 유동층에 파묻힌 전열관에 대하여 유동조건과 전열관의 배열효과에 대한 실험적인 연구를 나타냈다. 유동층의 단면적은 0.15 m × 0.30 m이고 높이는 1.0 m이다. 층물질은 강모래 평균입도 0.73, 1.24 mm의 두 가지와, 평균입도 0.9 mm의 무연탄 회재를 사용하였다. 유동층 높이는 0.45 m이었다. 마모실험은 조건마다 100시간동안 유동화속도 1.2-1.8 m/s까지 변화시켜 수행하였다. 실험결과 마모율은 유동화속도가 증가할수록 증가하였고, 공기분배기로부터 떨어진 거리가 증가할수록 증가하였다. 그리고 공기분배기로부터 높이 0.6 m의 비산영역에 위치한 전열관에서 심한 마모를 나타냈다. 전열관의 원주방향에 대한 마모경향은 다른 부분과 비교하여 시계방향으로 4시 방향에서 8시 방향까지 심한 마모가 나타났고, 특히 5시 방향과 7시 방향은 심한 마모를 보였다.

Erosion of in-bed tubes and water wall heat transfer surfaces by bed materials and elutriated particles have persistently plagued most fluidized bed combustion (FBC) systems. This paper presents a systematic experimental study of the effects of tube arrangement and flow condition on embedded tube erosion by using erosion-prone acrylic cylinders in a 0.15 m×0.30 m bench-scale cold fluidized bed. The bed material was two different sizes of river sand and anthracite ash with the average diameter of 0.73, 1.24, 0.90 mm, respectively. The static bed height was 0.45 m. Erosion test was performed with the variation of fluidization velocity of 1.2 to 1.8m/s for 100 hours per set. The result shows that the erosion rate increases with fluidizing velocity, with distance from the distributor. The erosion was severe at the tube located in the splash zone of 60 cm above the distributor. The trend with radial direction shows severe erosion at the 4-8 o'clock clockwise compare to other area, especially 5 and 7 o’clock clockwise.

Fluidized Bed Domestic Anthracite Ash Erosion Characteristics Heat Transfer Tube

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